hv111 Supertex, Inc., hv111 Datasheet
hv111
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hv111 Summary of contents
Page 1
... The circuit uses internal mirrors to measure current, eliminating the need for a sense resistor. The HV111 includes two current modes: i) initial current limit mode limits the current to 1.2A during turn on; ii) thereafter a 2A monitor circuit will re-trigger the servo mechanism back to 1 ...
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... I before the timer expires then an over current condition exists. The timer is immediately reset when a fault is cleared. LIMIT (3) Time for fast return to limit circuit to react. (4) Guaranteed by design. Package Options DPAK-5 HV111K4 -0.5V to 90V -40°C to +85°C -65° to +150°C 80°C/W 11°C means -20 C< T < ...
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... The third subsystem, PWM Iimit, is protection for turning on into a short (or a later dead short). In this case the HV111 helps avoid the dumping of large currents into the load by pulse width modulating (PWM) the current to limit Inrush current to <250mA average if V ...
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... The reverse Vbe voltage is protected by the series diode, D1. If PWRGD is open, then the current has no alternative but to flow into the base and thus connects the DC/DC ENABLE pin to the DC/DC ground reference (DRAIN pin of the HV111). As the clamp is inverting, therefore established. ...
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... Thermal Shutdown In addition to the above parameters, the HV111 will shutdown if the temperature on the die reaches ~135°C and it will not restart until the temperature drops to 100°C or less (could be significantly less). The thermal sensor is key in providing a bullet proof power management solution because it ensures that the device will turn off long before damage can occur ...
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... PWM current and the lower waveform is the input voltage). Reducing the current under severe shorts overcomes thermal cycling in which the HV111 turns on and off as it heats up and cools down in a severe fault (limiting the current successively to 1.2A until overheat). It also protects downstream systems by relieving them of the requirement to handle the 1 ...
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... Description of Operation Figure 9 – Turn on Waveforms Referring to Figure 9, the operation of the HV111 may be illustrated. On initial power application (waveform 1 in Fig. 9) the HV111 provides a regulated supply for the internal circuitry. Until the proper internal voltage is achieved all circuits are held reset, the N-channel MOSFET is off and the PWRGD bar pin is open (INACTIVE) ...
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... V NN DRAIN BAT HV111 Figure 12 – Diode ‘OR’ing Fast return to limit also acts as a circuit breaker with delay, in that large currents will be limited and then the system shut down if it does not recover. Keep in mind, however, that severe faults which bring V limited with the PWM Ilimit function. Fast return to limit also overcomes the problem of “ ...
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... Package Information Supertex inc. 2003 Supertex Inc. All rights reserved. Unauthorized use ofr reproduction prohibited. 1225 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 222-8888 · FAX: (408) 222-4895 9 www.supertex.com HV111 9/20/04 ...